Here’s looking at you. Dogs have three eyelids, an upper lid, a lower lid and the third lid, called a nictitating membrane or "haw," which helps keep the eye moist and protected.
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Here’s looking at you. Dogs have three eyelids, an upper lid, a lower lid and the third lid, called a nictitating membrane or "haw," which helps keep the eye moist and protected.
The more you know!